10138611721 has 64 divisors (see below), whose sum is σ = 12764381184. Its totient is φ = 7869312000.

The previous prime is 10138611713. The next prime is 10138611727. The reversal of 10138611721 is 12711683101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10138611721 - 2³ = 10138611713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (10138611727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25283121 + ... + 25283521.

It is an arithmetic number, because the mean of its divisors is an integer number (199443456).

Almost surely, 2^10138611721 is an apocalyptic number.

It is an amenable number.

10138611721 is a deficient number, since it is larger than the sum of its proper divisors (2625769463).

10138611721 is a wasteful number, since it uses less digits than its factorization.

10138611721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 10138611721 in words is "ten billion, one hundred thirty-eight million, six hundred eleven thousand, seven hundred twenty-one".